/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.ambari.logsearch.web.listener;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

public class LogSearchSessionListener implements HttpSessionListener {

  private Logger LOG = LoggerFactory.getLogger(LogSearchSessionListener.class);

  private int numberOfSessions = 0;

  @Override
  public void sessionCreated(HttpSessionEvent event) {
    synchronized (this) {
      numberOfSessions++;
    }
    LOG.debug(String.format("New session is created (Id: %s). Number of sessions: %d", event.getSession().getId(), numberOfSessions));
  }

  @Override
  public void sessionDestroyed(HttpSessionEvent event) {
    synchronized (this) {
      numberOfSessions--;
    }
    LOG.debug(String.format("Session destroyed (Id: %s). Number of sessions: %d", event.getSession().getId(), numberOfSessions));
  }
}
